<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<style>
    div{
        width: 500px;
        height: 300px;
        background-color: yellow;
        text-align: justify;
        /*
        padding 内边距
                一个值 四个方向
                两个值 上下左右
                三个值 上 左右 下
                四个值 上右下左
        可以通过padding-top/bottom/left/right
        */
        padding:20px 30px;
    }
</style>
<body>
    <div class="b1">
        Lorem ipsum dolor, sit amet consectetur adipisicing elit. Amet ullam molestiae ex maiores dolorem 
        deserunt nihil consequuntur sit iure eum vero voluptates, ad veritatis dolore officia, sed, optio molestias pariatur.
    </div>
    <div></div>
</body>
</html>